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Bethany Young was a 17 year old Radley Sanitarium patient who wandered onto the DiLaurentis property on the night of Alison DiLaurentis' attempted murder. Bethany was hit over the head with a shovel and was then buried alive by Melissa Hastings, who believed she was a deceased Alison, which resulted in her death. A year later, Bethany's body was discovered and identified as Alison, who had gone into hiding. About a year later her body was exhumed and identified, and The Liars started an investigation to find out who she was.

Melissa Hastings reveals that she was Bethany's killer. Melissa saw Spencer carrying a shovel that night and then found Bethany's body, unconscious. Melissa thought it was Alison and that Spencer had killed her, so she pushed her into a grave and buried her. However, it wasn't until later that Melissa found out that Bethany wasn't actually dead when this occurred, therefore meaning Melissa killed her.

Charlotte DiLaurentis reveals that she was on the roof with Bethany one night, as Charles and wearing a dress. They talked about escaping Radley until Marion Cavanaugh entered the roof. Charlotte/Charles was fearful of Marion seeing him in a dress, so he hid while Bethany talked to her. Bethany and Mrs. Cavanaugh talked and their conversation appeared to become heated, when Bethany suddenly shoved Mrs. Cavanaugh off of the roof. Charlotte/Charles ran up to her and asked what she done, and instead, she placed the blame on Charles.

Charlotte also reveals that Bethany stole her clothes and escaped Radley the night Alison was attacked. Bethany was going to hurt Jessica so Charlotte was planning on stopping her by killing her. Only Charlotte ended up hitting her sister Alison by mistake. This prompts Mona Vanderwaal to reveal that she was the one who hit Bethany. She said she believed it was Alison and she begins to cry over this.